Revert "Remove SHAPE_CAPACITY_CHANGE shapes"

This reverts commit f6910a61122931e4193bcc0fad18d839c319b720.

We're seeing crashes in the test suite of Shopify's core monolith after
this change.

1 files changed, 1 insertions, 0 deletions

diff --git a/shape.h b/shape.h
index f1823258da..6d4f3f9811 100644
--- a/shape.h
+++ b/shape.h
@@ -64,6 +64,7 @@ enum shape_type {
     SHAPE_ROOT,
     SHAPE_IVAR,
     SHAPE_FROZEN,
+    SHAPE_CAPACITY_CHANGE,
     SHAPE_T_OBJECT,
     SHAPE_OBJ_TOO_COMPLEX,
 };